keystone v3 api attempt

from keystoneclient.auth.identity import v3
from keystoneclient import session
from keystoneclient.v3 import client

# assume magical os_auth[] :)

auth = v3.Password(auth_url=os_auth['OS_AUTH_URL'],
                   username=os_auth['OS_USERNAME'],
                   password=os_auth['OS_PASSWORD'],
                   project_domain_name='default',user_domain_name='default',
                   project_name=os_auth['OS_TENANT_NAME'])
sess = session.Session(auth=auth)
keystone = client.Client(session=sess)
print keystone.users.list()


# fails with:

# Traceback (most recent call last):
#   File "/tmp/userlist.py", line 50, in <module>
#     print keystone.users.list()
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/utils.py", line 318, in inner
#     return func(*args, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/v3/users.py", line 107, in list
#     **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/base.py", line 71, in func
#     return f(*args, **new_kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/base.py", line 352, in list
#     self.collection_key)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/base.py", line 112, in _list
#     resp, body = self.client.get(url, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/httpclient.py", line 611, in get
#     return self._cs_request(url, 'GET', **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/httpclient.py", line 603, in _cs_request
#     return self.request(url, method, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/httpclient.py", line 578, in request
#     resp = super(HTTPClient, self).request(url, method, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/baseclient.py", line 21, in request
#     return self.session.request(url, method, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/utils.py", line 318, in inner
#     return func(*args, **kwargs)
#   File "/usr/lib/python2.7/dist-packages/keystoneclient/session.py", line 283, in request
#     raise exceptions.EndpointNotFound()
# keystoneclient.openstack.common.apiclient.exceptions.EndpointNotFound